Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




Hardware Clock Drift

The hwclock command provides the interface to the hardware clock. If you are wanting to ensure the correct time then with a default Debian set up it is recommended that you use ntp instead if you can. When you reboot the system will save the current correct time to the hardware clock.

Anyhow, the --adjust option of the hwclock command checks information stored in the configuration file /etc/adjtime and makes an actual correction to the time stored in the hardware clock to account for the drift that it (the hwclock utility) has been monitoring. (Each time you set the hardware clock with the hwclock command the current time is compared to the previous time it was corrected to determine the amount of drift.) Thus, when setting the system clock from the hardware clock it is advisable to do the following:

# hwclock --adjust
# hwclock --hctosys

When updating the hardware clock from an accurate system clock do:

# hwclock --systohc

Copyright © 1995-2006 [email protected]

  Published under the terms fo the GNU General Public License Design by Interspire